Overlay image/map on MapView?

Okay,开发者_Go百科 hope you can help med here :) I have been searching everywhere to figure this out, but haven't had any luck.

I know about Annotations and how to overlay them on a map on the iPhone. But what if I have location like in the forest where there arent any roads or anything. What I am asking is, how can I overlay a custom image (map) over the Map view so that it zooms the right way like the map, in the right scale, and can I add my own annotations on top of the custom image/map?

Hop I was clear enough on what I am trying to do?

It's doable but challenging using the 3.2 version of the SDK. See http://spitzkoff.com/craig/?p=108.

If you can wait until June, 2010 to release your app, you should consider using the SDK 4 beta. As I'm writing this, the SDK is still under NDA, so I'm very limited in what I can tell you, but I can quote Apple's public statements about What's New in iPhone OS 4:

Mapping applications can now include overlays that can identify regions on a map. Draw routes with annotations for customized directions and other functionalities.